The heating curve of water shows the relationship between the heat energy added to water and its temperature. It can be divided into several stages:
1. Solid ice at 0°C: When heat energy is added to ice, its temperature remains constant at 0°C until all the ice has melted.
2. Liquid water at 0°C: Once all the ice has melted, the temperature of the water begins to increase. However, the temperature remains constant at 0°C until all the water has reached the melting point.
3. Liquid water between 0°C and 100°C: Once all the water has reached the melting point, the temperature continues to increase until it reaches 100°C. At this point, the water begins to boil and the temperature remains constant at 100°C until all the water has turned into steam.
4. Gaseous steam at 100°C: Once all the water has turned into steam, the temperature of the steam continues to increase as more heat energy is added. However, the rate of temperature increase is slower than when the water was in its liquid state.
Overall, the heating curve of water shows that the temperature of water changes in distinct stages as heat energy is added or removed.